Proving 200% efficient charge generation via singlet exciton fission

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13669
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: The University of Tokushima
• Principal Investigator: Furube Akihiro 徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (30357933)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 有機太陽電池 / 励起子分裂 / 過渡吸収分光 / 電荷分離 / 有機分子性結晶 / フェムト秒分光 / 反応ダイナミクス / シングレットフィッション

Outline of Final Research Achievements

We investigated whether singlet exciton fission process in organic solid, where a triplet excitons pair is generated, can be applied to a solar cell with quantum efficiency of 200% from the elucidation of the primary reaction process. For rubrene single crystals, exciton fission occurs with a time constant of 10 ps. Here, tin oxide nanoparticles were studied as a substitute for fullerene, which is a common electron acceptor. We succeeded in producing a mixed system of microcrystals of rubrene and tin oxide nanoparticles. As a result of transient absorption spectroscopy, singlet fission was observed, but there was no process of charge separation of triplet excitons after that. This is because the diffusion length of triplet excitons is small. Conference presentation was made on this finding. Also, the exciton fission process of other molecular systems was elucidated and the result was published.

Free Research Field

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